BlueSnail's super soft Crib Mattress Cover set is made from knitting fabric which giving your baby a soft, comfortable surface to rest. The covers fit any standard size contour crib mattress. 1.Clean up is a breeze and your crib mattress are fully protected. 2.Soft and Breathable: Our Crib Mattress Cover are made of soft and breathable knitting fabric. 3.Flexible Fit: Perfect for Crib Mattresses,our universal fit allows most standard contour Crib Mattress , flexible and generous elastic.